Server Class

Methods documented for the Server Class in Arduino

  1. WiFiServer()

  2. begin()

  3. available()

  4. write()

  5. print()

  6. println()

In ESP8266WiFi library the ArduinoWiFiServer class implements available and the write-to-all-clients functionality as described in the Arduino WiFi library reference. The PageServer example shows how available and the write-to-all-clients works.

For most use cases the basic WiFiServer class of the ESP8266WiFi library is suitable.

Methods and properties described further down are specific to ESP8266. They are not covered in Arduino WiFi library documentation. Before they are fully documented please refer to information below.


Method accept() returns a waiting client connection. accept() is documented for the Arduino Ethernet library.


see accept

available in the ESP8266WiFi library’s WiFiServer class doesn’t work as documented for the Arduino WiFi library. It works the same way as accept.

write (write to all clients) not supported

Please note that the write method on the WiFiServer object is not implemented and returns failure always. Use the returned WiFiClient object from the WiFiServer::accept() method to communicate with individual clients. If you need to send the exact same packets to a series of clients, your application must maintain a list of connected clients and iterate over them manually.



With nodelay set to true, this function will to disable Nagle algorithm.

This algorithm is intended to reduce TCP/IP traffic of small packets sent over the network by combining a number of small outgoing messages, and sending them all at once. The downside of such approach is effectively delaying individual messages until a big enough packet is assembled.



By default, nodelay value will depends on global WiFiClient::getDefaultNoDelay() (currently false by default).

However, a call to wiFiServer.setNoDelay() will override NoDelay for all new WiFiClient provided by the calling instance (wiFiServer).

Other Function Calls

bool  hasClient ()
size_t  hasClientData ()
bool  hasMaxPendingClients ()
bool  getNoDelay ()
virtual size_t  write (const uint8_t *buf, size_t size)
uint8_t  status ()
void  close ()
void  stop ()

Documentation for the above functions is not yet prepared.